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동문선(東文選)의 루정기(樓亭記)에서 본 고려(高麗) 중(中).후기(後期)의 루정건축고(樓亭建築考)
이용범,천득염,임영배,Lee, Yong-Bum,Cheon, Deuk-Youm,Lim, Young-Bai 한국건축역사학회 1993 건축역사연구 Vol.2 No.2
The Purpose of this study is to look for the total conspectus of Roo-Jong(RJ) Architecture in the middle and latter era of Koryo Dynasty. The method of this study is the review of old literature, the Roo-Jung description of Dong-Mun-Sun, which had compiled in the Ninth year of Seung-Jong (AD 1478) by confucian scholar. The conclusions of this study can be summarized as follows : 1) The main currents of thought having a great influence on the RJ are thought of Mountain God (or Sin Sun, which is dwelling in mountain) or Taoist, thought of Lao-tzu and Chuang-tzu. They had required the RJ Architecture to pursuit the life of God. In this existence value meaning, the RJ Architecturethe is the semi-sacred & profane space. In the being aspect, RJ is the transcendental architecture. 2) The way of life of in the RJ had strongly turned from the personal space, mainly mind control place, into the friendship-society space, pastime place. 3) The RJ had located after the images that is what should be. The images were formed on the ground of natural landscape elements, communication elements. And these elements were indicated on one's visual, auditorial sensation with oneself. 4) In planning aspect, the scope of visual, Pungsu and history were aided with the factors of climate, topography and geography. Specially in location and fabric planning, they had regarded more important the objects and scope of visual than the climate factor.
이용범(Yong Bum Lee),김광민(Kwang Min Kim) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.11
굴삭기를 전진과 후진시키는 주행모터에는 주차브레이크(parking brake)가 내장되어있다. 이 주차브레이크는 굴삭기가 주차되었을 때 고정뿐만 아니라 전진 및 후진을 하지 않는 상태로 굴삭작업 할 때에도 차체를 지면에 고정시킨다. 정확한 굴삭작업을 위해서는 작업충격이나 자중을 포함한 굴삭부하가 발생했을 때 차체를 지면에 견고하게 고정해주는 브레이크 기능이 굴삭기가 주차되었을 때의 고정보다 더 중요하고 작용횟수 또한 훨씬 높다. 본 연구에서는 다중 마찰 판(multi friction disc)을 스프링 힘으로 작동(결합)시키고 유압실린더로 해제시키는 굴삭기 주행모터의 주차브레이크에 대해서 작용 압력별로 반복실험을 실시하여 측정된 데이터를 설계 이론값과 비교하여 주차브레이크의 특성을 분석하였다. The parking brake is an essential unit embedded in the track-driving motor of an excavator. The parking brake plays an important role in keeping the excavator in place not only when it is parked, but also during the digging operation. In fact, the load placed on the parking brake during the digging operation is significantly higher than the parking load, because the impact and rating loads caused by the bucket digging force cycle frequently and have very high load ranges. Therefore, the load conditions during the digging operation should be taken into account in the parking brake certification test. In this study, a series of experiments was carried out in which various operating pressures were applied to the parking brake, where repeated loads were reciprocally placed on the brake by locking the multifriction disc and releasing the hydraulic cylinder. The characteristics of the parking brake were investigated by comparing the obtained experimental results and the theoretical design specifications.
단일입력 다출력 PTO 기어박스의 내구성시험에 관한 연구
이용범(Yong Bum Lee),유한주(Han Ju Yoo) 유공압건설기계학회 2017 드라이브·컨트롤 Vol.14 No.1
This study analyzed a life test method for a power take-off (PTO) gearbox. An engine transfers mechanical power (rotation and torque) to a hydraulic pump through a PTO Gearbox with one input shaft and three output shafts. PTO gear box durability under high loads over long time periods was tested using dynamometers. In order to reflect the rated operating conditions, power must be distributed to each output shaft, and experiments were conducted under various conditions to verify the characteristics of the distributed power. An accelerated life test was designed using speed and torque as acceleration factors. Also, efficiency tests were conducted under various load conditions. Also, a lubrication oil composition analysis was performed to analyze gearbox wear status.
이용범(Yong Bum Lee),김광민(Kwang Min) 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.1
Hydraulic transmission is the main component delivering power to the drive wheels of an excavator during forward and backward movement, and it has low speed, high torque and high speed, low torque gear change ratios as a forward/backward two-speed main function. It also has additional function of ensuring that the excavator is stably fixed on the ground with the built-in parking brake during excavation operations. In this study, optimal design specifications are determined by modeling and simulating about the multi-disc-type friction clutch, which is the main component improving the reliability of the hydraulic transmission for a 14-ton wheel excavator, and the friction properties of the transmission clutch are analyzed by performing sample tests.